Düsseldorf 2007 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 24: Poster II - Interaction with VUV and X-ray light

A 24.5: Poster

Donnerstag, 22. März 2007, 16:30–18:30, Poster B

Electron dynamics in clusters excited by strong short-wavelength laser fields — •Ionuţ Georgescu, Ulf Saalmann, and Jan-Michael Rost — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzerstr. 38, 01187 Dresden, Germany

Shining a strong short-wavelength laser pulse on rare gas clusters results into dense, warm plasmas which absorb energy very effectively by means of inverse bremsstrahlung. Due to the small quiver energy (in contrast to IR pulses) and to the small kinetic energy of the photoelectrons (in contrast to X-Ray pulses), these systems show unique features such as inner-ionization, charge localization and shift of the atomic levels due to screening.

We discuss the theoretical description of these processes, which turn out to depend critically on the treatment of the inner ionization process as well as on the electron-ion interaction potential.

Furthermore, we present our results which are in very good agreement with the initial experiments at 98nm and the most recent ones at 32nm wavelength, both performed at the free electron laser facility at DESY, Hamburg. Finally, we propose a pump-probe scheme with atto-second XUV pulses to gain further, time resolved insight into the energy absorption process.